6 CONTENTS. 



Chemical examination of fruits and fruit products — Continued. 

 Methods of analysis — Continued. 



Detection of foreign coloring matter — Continued. Page. 



Detection of coal-tar colors by extraction with solvents 26 



Detection of acid magenta 28 



Detection of cochineal 28 



Detection of caramel 28 



Detection of gelatin 29 



Detection of agar-agar 29 



Detection of starch 30 



Determination of heavy metals 30 



Added substances 31 



Glucose 31 



Preservatives 34 



Starch 35 



Coloring matter 36 



Gelatinizing agents 37 



Artificial sweetening materials 38 



Foreign fruits 38 



Heavy metals 39 



Analytical data 41 



Fresh fruits and fruit juices 41 



Solids 47 



Ash 47 



Acidity 47 



Protein 47 



Sugars 48 



Polarization 48 



Alcohol precipitate 49 



Jams and jellies prepared in the laboratory 50 



Commercial fruit products 53 



Jams 53 



Discussion 53 



Jams containing no glucose 59 



Jams containing glucose, but not so labeled 63 



Compound jams 70 



Jellies 73 



Jellies containing no glucose 73 



Jellies containing glucose, but not so labeled 78 



Compound jellies 81 



Canned fruits 84 



Brandied fruits 96 



Fruit butters 96 



Solid marmalades 98 



Correspondence with manufacturers 98 



Microscopical examination of fruits and fruit products 105 



